1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
|
/*
* Copyright (C) 2015 Intel Corporation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* A Proximity sensor with a true/false value read in via GPIO
* is implemented. The Sensor HAL returns a float for the proximity
* distance... but in the case of a GPIO sensor, we only have close and
* no-close (1/0). We fake the distance by returning the values below.
*/
#define kProximityClose 0.0
#define kProximityFar 100.0
/*
* We monitor GPIO48 for the proximity reading.
* This corresponids to IO7 on the Arduino shield and is
* not multiplexed with any other functionality.
*
* The mraa library expects the Arudino sheild pin number here when
* talking to the Arduino expansion board. Change this appropriate when
* using a different GPIO pin or different Edison breakout board.
*/
#define kPinGPIO 7
#include <cutils/log.h>
#include "ProximityGPIO.hpp"
#include "SensorsHAL.hpp"
struct sensor_t ProximityGPIO::sensorDescription = {
.name = "Proximity GPIO Sensor",
.vendor = "Unknown",
.version = 1,
.handle = -1,
.type = SENSOR_TYPE_PROXIMITY,
.maxRange = 100.0f,
.resolution = 1.0f,
.power = 0.001f,
.minDelay = 10,
.fifoReservedEventCount = 0,
.fifoMaxEventCount = 0,
.stringType = SENSOR_STRING_TYPE_PROXIMITY,
.requiredPermission = "",
.maxDelay = 1000,
.flags = SENSOR_FLAG_ON_CHANGE_MODE,
.reserved = {},
};
Sensor * ProximityGPIO::createSensor(int pollFd) {
return new ProximityGPIO(pollFd, kPinGPIO);
}
void ProximityGPIO::initModule() {
SensorContext::addSensorModule(&sensorDescription, createSensor);
}
ProximityGPIO::ProximityGPIO(int pollFd, int pin) : upm::GroveButton(pin), pollFd(pollFd) {
handle = sensorDescription.handle;
type = SENSOR_TYPE_PROXIMITY;
}
ProximityGPIO::~ProximityGPIO() {}
int ProximityGPIO::pollEvents(sensors_event_t* data, int count) {
data->distance = !value() ? kProximityClose: kProximityFar;
return 1;
}
int ProximityGPIO::activate(int handle, int enabled) {
/* start or stop the acquisition thread */
return activateAcquisitionThread(pollFd, handle, enabled);
}
|
